(See also note about the book “When Jesus Became God” at the bottom of this post).

Yeshua (Jesus Christ) was not a Christian. He was a Torah observant Jew. So were the Apostles Rabbi Sha’ul (Paul) and Kepha (Peter) – they were not Christians but Torah observant Jews. They kept the Sabbath and celebrated YHWH’s feasts according to Lev.23 and ate kosher.
Was Emperor Constantine the Great a Christian? What was his intention when he founded pagan “Christianity” (Churchianity)? Did he see the Christian cross in a vision? Or did he follow Mithraism?
See also Constantine the Great and Christianity: http://en.wikipedia.org/wiki/Constantine_the_Great_and_Christianity .